I don’t know it’s a bug or not but ‘Error While expunging folder‘ error message in Evolution is very annoying. You can’t empty your Trash bin mean if you don’t solve your evolution local database will become bigger and bigger. There are few solutions you can get from the Internet.

I wrote this article for easier solution with very clear instructions.

As you can see from the below picture, at the bottom screen, this error suddenly occur when I tried to empty my Evolution trash (File > Empty Trash).